Much to everyone's dismay, dear Avalon, lightsabers are basically an impossibility.If they were made of light, they would need some kind of containing deal so the beam wouldn't just keep going like a flashlight or something. And if they had that they wouldn't be able to conveniently retract and all. Also, being made of light makes it impossible for them to thwack against each other like swords in epic lightsaber battles.